Random trainers?

Hello, I'm trying to make a random trainer event. I want the random trainer to use random pokémon lineups every time we battle him/her. I already know that the battle tower's trainer event is best for that, but I don't really know how to set the trainer up as a normal battle event instead of using the Battle Tower event.
I'd also like to know if we could set the levels randomly instead of Level 50 or Open Level levels...

There's the Random Pokémon Script and Random Battle Generator script, both made by Umbreon. Try messing around with them and see if they suit your needs.

Thank you for the prompt reply Savor. I do like how easy it is to randomize the Battle Tower's pokémon and trainers and how it could be customized through btt.txt already, but those scripts seems more interesting. Thanks for the input, I'll try it for now.

EDIT: Alright, so I tried the scripts, and while it does make pokémon trainers and encounters random, I want the pokémon trainers to be a bit more specific, not too random. I want something that makes a trainer with the same name having specified pokémon, something like...

SWIMMER_M
Poseidon
SQUIRTLE,PSYDUCK,POLIWAG,TENTACOOL,MAGIKARP,(All unevolved water pokémon, but each battle will only pick 6 of them.)...
Random levels (Or equal to player's level) and such...